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41. 发明专利

JP2001001876A BRAKING STATUS JUDGMENT MEANS FOR VEHICLE AND LONGITUDINAL BRAKING FORCE DISTRIBUTION CONTROL DEVICE WITH THE BRAKING STATUS JUDGMENT MEANS 失效
公开(公告)号：JP2001001876A
公开(公告)日：2001-01-09
申请号：JP17419899
申请日：1999-06-21
申请人： AISIN SEIKI , TOYOTA MOTOR CORP
发明人： YOKOYAMA SATOSHI , SAKANE SHINSUKE , FUKAMI MASANOBU , TSUCHIYA YOSHIAKI
IPC分类号： B60T8/1766 , B60T8/26 , B60T8/32 , B60T8/34
摘要： PROBLEM TO BE SOLVED: To provide braking status judgment means capable of surely judging as to whether a brake pedal is quickly depressed or not without requiring any special sensor and a control device performing a longitudinal braking force distribution according to the judgment results. SOLUTION: A device comprises wheel speed detection means WS detecting the wheel speeds of a front wheel Wf and a rear wheel Wr and front and rear wheel speed difference calculation means DF calculating a wheel speed difference between the front wheel Wf and rear wheel Wr. Based on results detected by brake operation detection means OB detecting the operation of the brake pedal BP and on the results of calculation by the front and rear wheel speed difference calculation means DF, braking status judgment means BD judges as to whether the quick depressing operation of the brake pedal BP is performed or not. Based on the results of judgment by brake pedal quick depression judgment means SB and according to an output detected by the wheel speed detection means WS, a longitudinal braking force distribution control device drives a hydraulic control device FV to adjust the braking force of the rear wheel Wr relative to that of the front wheel Wf to a specified relation.

42. 发明专利

JPH0692157A DRIVE TORQUE DISTRIBUTION CONTROL DEVICE 失效
公开(公告)号：JPH0692157A
公开(公告)日：1994-04-05
申请号：JP26814692
申请日：1992-09-10
申请人： TOYOTA MOTOR CORP , NIPPON DENSO CO
发明人： TSUCHIYA YOSHIAKI , WATANABE TAKASHI
IPC分类号： B60K17/348 , B60K17/35 , B60K23/04 , B60T8/1761 , B60T8/58
摘要： PURPOSE:To prevent a situation such as not starting antilock control in opposition to a program by decreasing a differential limit amount of front/rear wheels in a straight braking condition smaller than in a turn braking condition, in a device mounted on a vehicle, where antilock control is performed by estimating a car speed from a wheel speed, to control a ratio of respectively distributing engine torque to front/rear wheels. CONSTITUTION:Even when a vehicle is placed in a braking condition (S104), unless the vehicle is concerned to the case that a synthesized value GXY of longitudinal acceleration GX and cross acceleration GY is a reference acceleration GM or more (S105) and further an absolute value of the longitudinal acceleration GX is reference acceleration GN (

43. 发明专利

JPH0672309A ANTI-SKID CONTROLLER 失效
公开(公告)号：JPH0672309A
公开(公告)日：1994-03-15
申请号：JP25409392
申请日：1992-08-28
申请人： TOYOTA MOTOR CORP , NIPPON DENSO CO
发明人： TSUCHIYA YOSHIAKI , WATANABE TAKASHI , YAMAMOTO MASAHIRO
IPC分类号： B60T8/58 , B60T8/172 , B60T8/1763
摘要： PURPOSE:To conduct accurately the detection of a partial low mu road by detecting the partial low mu road in a case in which anti-skid control in regard to rear wheels becomes necessary within a set time after the start of anti-slid control in regard to front wheels. CONSTITUTION:A four wheel drive vehicle is equipped with a central differential gear 10 and respective front and rear differential gears 20, 30. Respective liquid pressure control valves 50, 52, 56 to connect the respective wheel cylinders 40-46 of respective vehicle wheels 26, 28, 36, 38 to a liquid pressure source 54 are controlled by means of an anti-skid controller 62 on the basis of respective outputs from respective vehicle wheel speed sensors 70-76 or the like. In this instance, a partial low mu road is detected in a case in which the anti-skid control of respective rear wheels 36, 38 becomes necessary within a first set time after the start of the anti-skid control of respective front wheels 26, 28. The start of anti-skid control in regard to respective rear wheels 36, 38 is prohibited within a second set time that is between the start time point of anti-skid control in regard to respective front wheels 26, 28 and the start time point of the first set time.

44. 发明专利

JPH0656025A PARTIALLY LOW MU ROAD DETECTING DEVICE 失效
公开(公告)号：JPH0656025A
公开(公告)日：1994-03-01
申请号：JP23540492
申请日：1992-08-11
申请人： TOYOTA MOTOR CORP , NIPPON DENSO CO
发明人： TSUCHIYA YOSHIAKI , WATANABE TAKASHI
IPC分类号： B60T8/66 , B60R16/02 , B60T8/172 , B60T8/1764 , B60T8/58 , G01N19/02
摘要： PURPOSE:To detect accurately being a partially low mu road by including a partially low mu road deciding means which decides being the partially low muroad in a case in which a measured time is within a set range, and a set time setting means which decides the set range on the basis of at least a vehicle speed and a wheel base. CONSTITUTION:A partially low mu road flag Fmu is set in a case in which two decisions of decision A and decision B are materialized. In the case of the decision A, whether vehicle wheel acceleration is in damping vibration at a proper vibration number or not is decided, and in the case of the decision B, whether a time that is from a time when front wheel slip is considered excessive to a time when rear wheel slip is considered excessive, is within a set range or not is decided. Also, decisions A and B are conducted at the initial time of anti-skid start. At S26 and S27, whether or not a decision A materialization flag FA and a decision B materialization flag FB are respectively set is decided, and in a case in which both are decided to be YES, it is decided that the partially low mu road exists.

45. 发明专利

JPH01208256A ANTISKID CONTROL DEVICE 失效
公开(公告)号：JPH01208256A
公开(公告)日：1989-08-22
申请号：JP3252488
申请日：1988-02-15
申请人： TOYOTA MOTOR CORP
发明人： SUGITANI TATSUO , AKIYOSHI MICHIO , TSUCHIYA YOSHIAKI
IPC分类号： B60T8/1755 , B60T8/172 , B60T8/1764 , B60T8/58 , B60T8/66
摘要： PURPOSE:To ensure running stability and controllability by making breaking torque reduce on changing aimed slip condition on rear wheels when unstable running condition of a vehicle is detected, and making braking torque on front wheels reduce when lack condition in controllability is detected. CONSTITUTION:When unstable running condition is detected by a running condition detecting means M6 based on a steering angle on a steering wheel and yaw rate on detecting means M4, M5, at least, aimed slip condition on rear wheels M1R is changed and braking torque on rear wheels M1R is made to reduce by a slip condition detecting means M2 and a braking control means M3. While, when lack condition in controllability is detected, at least, aimed slip condition on front wheels M1F is changed and braking torque on front wheels M1F is made to reduce. Thus, running stability or controllability under braking a vehicle is not lowered by turning of the vehicle or disturbance, therefore braking performance under turning of the vehicle can be improved.

46. 发明专利

JPS63240459A TWO-SYSTEM ANTILOCK TYPE PRESSURE FLUID BRAKE DEVICE 失效
公开(公告)号：JPS63240459A
公开(公告)日：1988-10-06
申请号：JP7552987
申请日：1987-03-27
申请人： TOYOTA MOTOR CORP
发明人： AKIYOSHI MICHIO , TSUCHIYA YOSHIAKI
IPC分类号： B60T8/66
摘要： PURPOSE:To enable a normal side brake device to hold its fluid pressure to a proper value, by setting a target wheel speed, which is set in accordance with an estimated car body speed, so that a difference between the target wheel speed and the estimated car body speed increases larger when a defect is detected in one system of the two-system brake devices. CONSTITUTION:The captioned device, which detects in a wheel speed detecting means E a rotary speed of wheels A, B in each group of plural wheels divided into two groups estimating a car body speed in accordance with the detection output being based on the maximum of the wheel speeds in a target speed setting means F, sets a target wheel speed lower than this estimated speed. And the device, when the speed of each wheel decreases lower than the target wheel speed, controls a brake fluid pressure by a fluid pressure control unit G so that the wheel speed increases to almost the target wheel speed. Here the device is constituted setting the target wheel speed so that its difference from the estimated car body speed increases larger than normal by a defect-time control means I when a defect in one of the two systems is detected by a defect detecting means H.

47. 发明专利

JP2003267244A ELECTRIC POWER STEERING DEVICE 审中-公开
公开(公告)号：JP2003267244A
公开(公告)日：2003-09-25
申请号：JP2002068061
申请日：2002-03-13
申请人： TOYOTA MOTOR CORP
发明人： TSUCHIYA YOSHIAKI
IPC分类号： B62D6/00 , B62D5/04 , B62D101/00 , B62D119/00 , B62D137/00
摘要： PROBLEM TO BE SOLVED: To effectively prevent the resonance frequency of a vehicle in yaw direction and the resulting traveling stability of the vehicle from being lowered when a reciprocating steering is performed at a frequency in a yaw resonance frequency range without excessively increasing a steering reaction at normal steering. SOLUTION: A steering frequency Pc is calculated by the detection of reversal in a steering direction to determine whether or not the steering frequency is within the range of a specified steering frequency and may cause the yaw resonance frequency on the vehicle (S30-100). If the yaw resonance frequency may occur, a viscosity compensating toque Td for preventing the yaw resonance oscillation of the vehicle based on a steering speed ω, a vehicle speed V, and the maximum value Tp of the magnitude of a steering torque Ts is calculated to a value larger than a value obtained at normal steering (S140-170). An electric motor 26 is controlled based on a target control toque Tc obtained as the sum of a supporting steering toque Ta based on the steering torque Ts and the viscosity compensating toque Tdf after the treatment of a low-pass filter (S180200). COPYRIGHT: (C)2003,JPO

48. 发明专利

JPH07215201A WHEEL SLIP CONTROL DEVICE 失效
公开(公告)号：JPH07215201A
公开(公告)日：1995-08-15
申请号：JP1058794
申请日：1994-02-01
申请人： TOYOTA MOTOR CORP
发明人： TSUCHIYA YOSHIAKI
IPC分类号： B60T8/66 , B60T8/172 , B60T8/1763
摘要： PURPOSE:To eliminate the influence of a hysteresis of the change in mu in relation to the increase or decrease in torque applied to wheels to pertinently control slip of the wheels by prohibiting the change of the quantity of slip by means of a changing means when it is judged that the quantity of slip of the wheels is changing in the direction of increasing it. CONSTITUTION:A braking device 10 is provided with a brake pedal 12 arranged in a car-room, and the brake pedal 12 is connected to a master ring 16 through a booster 14. One of pressurizing chambers of the master ring 16 is connected through solenoid valves 18A, 18B respectively to wheel cylilnders 20A, 20B provided at the right and left front wheels of a vehicle. The other of the pressurizing chambers is connected through solenoid valves 18C, 18D respectively to wheel cylinders 20c, 20D provided respectively at the rear wheels of the vehicle. Further, the solenoid valve 18A to 18D are respectively connected to a controller 24 composed of microcomputer, etc.

49. 发明专利

JPH0692218A ANTISKID DEVICE 失效
公开(公告)号：JPH0692218A
公开(公告)日：1994-04-05
申请号：JP26814792
申请日：1992-09-10
申请人： TOYOTA MOTOR CORP , NIPPON DENSO CO
发明人： FUJITA KOZO , TSUCHIYA YOSHIAKI , WATANABE TAKASHI
IPC分类号： B60T8/58 , B60T8/172 , B60T8/1763
摘要： PURPOSE:To provide a device which can conduct the antiskid control during low speed running. CONSTITUTION:If the running speed of an automobile is higher than 15km/h and the slip rate of a wheel exceeds a preset state, the antiskid control is started by pressure reducing control for putting an electromagnetic control valve in the pressure reducing state (S13, S19). If the running speed is less than 15km/h and the wheel is locked, the antiskid control during low speed running is started (S9, S10). The pressure reduction in this case is gently conducted by pulse pressure reducing control for alternately switching the electromagnetic control vale to the pressure reducing state and to the holding state (S15). The holding time is calculated according to a value GXY which is the acceleration in the advancing direction of an automobile and corresponds to a coefficient of friction of the road surface (S2, S3) and the antiskid control is conducted according to the coefficient of friction of the road surface.

50. 发明专利

JPH0672308A ANTI-LOCK CONTROLLER 失效
公开(公告)号：JPH0672308A
公开(公告)日：1994-03-15
申请号：JP25078092
申请日：1992-08-26
申请人： TOYOTA MOTOR CORP , NIPPON DENSO CO
发明人： OKOCHI NORIHIKO , TSUCHIYA YOSHIAKI , WATANABE TAKASHI
IPC分类号： B60T8/58 , B60T8/172 , B60T8/1763
摘要： PURPOSE:To secure a control characteristic that coincides precisely with a road surface characteristic (the coefficient of friction), by deciding the control characteristic of brake pressure at anti-lock control on the basis of not only acceleration/deceleration in a vehicle longitudinal direction but also acceleration/ deceleration in a vehicle latitudinal direction. CONSTITUTION:A brake pedal 10 is connected to a master cylinder 14 through a booster 12. Meanwhile, the master cylinder 14 is connected to respective brake wheel cylinders 26, 36, 46, 54 at respective right and left and front and rear vehicle wheels FL-RR through respective plural solenoid valves 22, 43, 42, 50 and liquid passages 24, 34, 44, 52 or the like. Respective solenoid valves 22... are respectively controlled by means of an electronic control unit 80 on the basis of respective detection signals from respective vehicle wheel speed sensors 102-106 and respective acceleration sensors or the like. In this instance, the control characteristic of brake pressure at anti-lock control is decided on the basis of not only acceleration/deceleration in a vehicle longitudinal direction but also acceleration/deceleration in a vehicle latitudinal direction.

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